Gas pipe size

[paul_round]

Without checking, I think it's 130

 

[hard-work]

What is the kW?

 

[ianmcd]

while perfectly possible to have 23mb working pressure at the meter it would be unusual, certainly around here unless you have had this problem and someone has cranked the meter gov up to the max to try and increase the pressure at the appliance, 22mm would normally be enough but depends on the run of the pipe and how many bends etc, if you do indeed have that pressure drop as you have been advised you have either a blockage or a blocked filter somewhere, either way you need an engineer to check it out for you

 

[paul_round]

Ian, that's what I plan to do. Pipework comes from meter outside, through house up into loft, so quite a long pipe run.

 

[McCombi]

Could be it's always been like that and it's a standard efficiency suprima boiler so nobody has ever checked inlet working pressure as the burner pressure has always been ok

 

[Daveydub]

nobody has ever checked inlet working pressure as the burner pressure has always been ok

Possibly, depends on the KW whether burner pressure could have been OK. Think that gas rating ought to have shown a problem at some point. I still have misgivings about the recent test ie: was burner pressure being read rather than inlet pressure? Was standing pressure being taken at meter rather than operating pressure? Just seems like a large drop to go unnoticed by 9 engineers.

 

[McCombi]

True.
May have never been gas rated by any though. I seldomly do a gas rate on a se boiler if bp ok and no evident signs of any issues

 

[Daveydub]

Really it is anybodys guess but my money would be on the most recent engineer having cocked it up. Could go either way

 

[ianmcd]

I am inclined to think it is a meter governor problem and the 23mb is standing pressure, but I cant argue with another engineer who has actually seen the job, I would have thought the length of time it has been in someone would have noticed by now, the run of pipe you have is very common and if all the way in 22mm, wouldnt have thought it was a pipe sizing problem, but again I havent seen the set up

 

[gas112]

So its a suprima what model and where did he take the working pressure from?
as 11mb is perfectly acceptable working pressure for the SE suprima range from a 40,000 model to an 80,000 model

 

[DP]

So its a suprima what model and where did he take the working pressure from?
as 11mb is perfectly acceptable working pressure for the SE suprima range from a 40,000 model to an 80,000 model

Gas, is 11mbar Burner pressure or inlet pressure (at the gas valve)
Had one similar a while ago, loads of black dust in pipe causing excessive pressure drop

 

[gas112]

burner pressure DP

 

[paul_round]

I'll try to check actual model and wattage this evening.

 

[paul_round]

Ok, it's a Suprima 100L, but there are no markings with wattage on it.
Installation date, 2005.

 

[Dan Robinson]

Burner Pressure should be 13.6 mbar. So.... Get second opinion.